反应详情

A slurry of dry calcium chloride (22.7 g, 0.205 mol) in ethanol (300 mL) and THF (300 mL) at 0° C. was treated portionwise with sodium borohydride (15.5 g, 0.41 mol), stirred for 2.5 hours, treated with dimethyl 2,5-pyridinedicarboxylate (20.0 g, 0.103 mol), stirred for 20 minutes, treated with saturated ammonium chloride solution (100 mL), and concentrated. The concentrate was dissolved in dichloromethane, and the solution was washed sequentially with saturated ammonium chloride solution, water, and brine, dried (MgSO4), filtered,and concentrated to provide the desired product containing approximately 10% methyl 6-hydroxymethylnicotinate. This mixture was used directly in the next step without further purification.

1. stirringstirred for 20 minutes
2. concentrationconcentrated
3. dissolutionThe concentrate was dissolved in dichloromethane
4. washthe solution was washed sequentially with saturated ammonium chloride solution, water, and brine
5. dry with materialdried (MgSO4)
6. concentrationfiltered,and concentrated